Copyright © 2006, ZMD AG, Rev. 0.8, 2006-04-12

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ZMD30011

LIN Transceiver

Datasheet

PRELIMINARY

2. Pin Description

2.1

Pin Configuration

PIN

Symbol

Description

1

RXD

receive data output

2

EN

sleep control input

normal mode=high

sleep mode=low

3

WAKE

local wake-up input

4

TXD

transmit data input

5

GND

ground

6

LIN

single wire bus input/output

7

VSUP

battery supply input

8

INH

battery related inhibit output

to control an external voltage

regulator

Fig. 3: Pin Configuration

2.2

RXD-Pin

This pin reports the state of the LIN bus voltage to the protocol controller. A LIN-low-level (dominant state) is

transmitted as a CMOS-low-level. A recessive LIN-state (LIN-high-level) is transmitted as a CMOS-high-level.

The RXD output structure is an open-drain output stage. This allows the ZMD30011 to be used with 3.3 V or 5 V I/O

protocol controllers. If the controller’s RXD pin does not have an integrated pull-up, an external pull-up resistor to

the microcontroller I/O supply voltage is required. The driver is tristated in the sleep-mode.

2.3

EN-Pin

This input determines the operation mode of the device. EN=high sets the device to the normal-mode, EN=low sets

the device to the sleep-mode significantly reducing the current consumption.

If the signal is floating then the EN-pin is held on low by an internal pull-down-resistor. The pull-down-current is

restricted to 25 A typically.

2.4

WAKE-Pin

The wake-pin is a high-voltage-input. A low-signal from the system (trigger) wakes up the transceiver from the

sleep-mode (local wake-up). An input filter prevents unintended wake-up in the case of transients. An internal pull-

up-resistor prevents floating of the pin in the unconnected state.

If the application does not require a local wake-up than the wake-pin has to be connected with VSUP.

1

2

3

4

8

7

6

5

SOP8

150 mil

top view